footer .backtotop {
    position: fixed;
    width: 60px;
    height: 60px;
    bottom: 120px;
    right: 50px;
    background: rgba(28, 31, 33, 0.5);
    border-radius: 2px;
    color: white;
    line-height: 60px;
    text-align: center;
    font-size: 30px;
  }